They can be made to work well in wide BW apps such as with 'full-range' drivers, but for best performance overall they must be designed with a fairly low acoustic XO, which is too often ignored and why so many designs I've auditioned or seen posted on the various forums either have a 'hole in the middle' of its response and/or sound too 'phasey'/'muddy' through the mids due to excessive front/rear output timing errors to qualify as 'HIFI' for me.
Agreed, that wasn't my intent.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Duh...meant to mention what you said about designing in HPF beige quite useful. Just dropped out of brain.
Kinda doubt the average user could do that though, so I do try and err on the safe side.
My attention span is too short these days to walk a newb thru a large can of worms.So I just try to not get into doing it. I'll be talking about something else before the conversation is over.
Your neighbors called. They like your music.
Since were on the subject of BLH's is there an easy way to calculate the horn? I read all night different pages on horn design, downloaded hornResponse and got nowhere. Here is a design I came up with. It's 40 w x 30 H x 18 d. The horn will exit out the side.
Yes, once you understand horn design theory.
Your design is a simple pipe horn with no well defined low pass filter [the front chamber of a FLH]. The 'BIB' calculator will spit out a simple conical/parabolic pipe horn. Viewed another way, a horn's filter chamber is a typical vented speaker box where the vent opening is the throat of the horn, so once you understand what you're trying to do, you can design a good enough scoop horn using a simple vented box calculator such as BoxPlot or similar.
I haven't read them, but MJK has written some papers on horn design that will probably be helpful and for sure, any typical speaker design will sim more realistically using his MathCad software than HR's 'ideal', no damping, plots that tend to be very misleading if you don't know how to interpret them: Horn Theory
Anyway, there was a design routine posted on the DIYaudio 'full-range' loudspeaker forum several years ago that folks were satisfied with its results, but unfortunately I've lost the link and don't recall the author, but searching the forum should turn it up for you.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
It seemed worthwhile at this point to post the following links...slight trepidation involved don't want anybody to get overwhelmed...but lots of good stuff
Marshall Leach's site
W. Marshall Leach, Jr.
DB Keele's site
AES Papers -- Official website of D.B.Keele
Your neighbors called. They like your music.
Thanks OG, I'll try these too.Originally Posted by Old Guy
Maybe between all of it It'll start to jive.
Ok questions about the BIB calculator, Am I supposed to just fill in the FS,Vas and QTS and let the program do the work or am I supposed to fill in all the blanks? and If so I'm stuck on # 10 and 11 (depth internal - width internal) what do these mean? also if I am supposed to fill in the other info can I use sq,in for the VB and SM? because that's what I did. My speaker is in column C.
Never mind I figured it out....it's friggin huge!! can I fold the horn more? 125" is pretty damn long.
Last edited by cradeldorf; September 21st, 2011 at 03:41 PM.
Thanks Greg, I am attempting to read all that Martin king wote on BLH designing.. needless to say he' makes me feel more retarded than I already did.
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